Process of making printing-plates.



G. R. CORNWALL.

PROCESS OF MAKING PRINTING PLATES.

APPLICATION mu) NOV. 30. 1914.

1,207,506. Patented Dec. 5,1916.

FL .1. F .2 y y Printing is the art Prinfing is the art preservative. The 7 preservative The conservator of all \conservator of all h arts. It is ihe 4-N teh arts. It'is the l/,/ universal educator /univers a1 educator and brings he ihought and brings he thought of one to all who wish 6 of one to all who wish to know or to learn to know or to learn from him. 5 from him.

Printing is the art preservative. fThqle conservator 0 a1 the arts. It is the universal educator and brings the thought of one to all whowish the arts. It is the WITNESSES: I/ INVEN ATTORNEY STATES PATENT QFFICE.

R, oonn'we PROCESS OF MA "33, r

application filed November 313, 191 1,

T all whom it may concern.

Be it known that I, GEORGE E. CORNWALL, a citizen of the nited States, and a resident or" llye, in the county of WVestchester and State of New York, have invented new and useful lmprovements in Processes of Male ing Printing-Plates, of which the following is a specification.

The invention relates to processes for rendering manuscript or other copy into printing plates, and more especially in certain of its aspects a process for correcting proof and otherwise bringing the matter into the desired final form, or into such form or condition as is suitable for making into a printing plate.

The objects and advantages of the invention will in part be set forth hereinafter and will in part be obvious therefrom, and these are attained by the means and methods pointed out in the accompanying claims.

The invention consists in the novel steps, processes, combinations and improvements herein shown and described.

The accompanying drawings, referred to herein and constituting a part hereof, illustrate one manner of practising the invention and together with tl e description serve to explain the principles thereof.

Of the drawings: Figure 1 shows a light transmitting sheet carrying typographic or letter press matter, mounted upon a support, there being an error in one of the lines; Fig. 2 shows such a sheet mounted upon a light transmitting support, and with the erroneous line out out but still in place; Fig. 3 shows a sheet o similar to that of Fig. l. but carrying a single line with the correct matter; A i 2: is a showing similar to Fig. 2 with the correct line substituted in the typographic matter thereon Fig,

is an edge view of 3.

especially applicable The invention is where the manuscript or other copy or the like, is reproduced n printed form, and usually in justified lines, as an intermediate step in making a printi which plate is to b press n IIOYII YV large number A ted impressions made. The matter so printed in the i no ess of securing or producing the printi plate, when produced in justified, lines, be in page or column form, upon a sheet of material, or the sac paper or other suits. cessive' lines may he separate line strips,

Specification of Letters Eatent.

Patented Dec. 5, 1916.

which likewise be arranged in page or column form. in most of the ordinary kinds of work, it is preferable to have a plurality of the lines in columnor page form upon a single sheet or strip. Such a form and arrangement of the printed matter may be produced in various ways, a machine capable of producing such matter being shown and described in U. S. Patent No. 921,946, dated May 18, 1909 to Brown, Hanrahan and Sellar, and another such machine being shown and described in U S. Patent No. 1,115,472, dated ()ctober 2'7, 191% to Charles T. Moore.

In the accompanying drawing, illustrating by way of example an embodiment of the invention, a sheet 1 of suitable material, such as a thin, strong, and highly translucent paper is provided, carrying a series of lines 2 of printed matter in justified relation, and disposed or arranged in column or page form upon the sheet 1'. The mediumin which the characters are placed or printed upon the sheet or strip. 1 maybe any suitable ink, and in certain cases I employ an ink which has been sized or otherwise prepared to receive and hold an opaquing material. The printed characters may be rendered opaque by applying thereto a fine powder, such bronze powder or the like. The sheet has applied thereto, or ii, an adhesive medium ago h will cause it to adhere to the su e or d1fferent surfaces of proper character or properties. In certain aspects of the intention, an adhesive medium is which will' permit of the strip repeatedly taken up and put 1e same or different supportdown ing s1. eatedly, Such adhesive or holdin 1 permit the sheet or strip to be 1 cm such adhesion or adherent iclr and easily and withone one featur or the invention,

ing the strip or again put down condition g it has in view the cutting out of a single line or group of lines, and the substitution of other lines or groups of lines in place thereof upon the support, in making corrections and transpositions, or other changes, in getting the composed matter in the ultimate form for printing and preparatory to making the printing plate. Such an ad hesive medium may be made by dissolving beeswax inbenzol to a gelatinous consistence although paraffin or other waxes may be used for this purpose if desired.

The adhesive agent is applied to the printed sheet or strip in a suitable way, either by being poured thereover, applied with a brush, or the sheet or strip may be dipped therein, or by filming it on the surface of the support and then pressing the sheet thereon. Such an adhesive is also moisture resisting or non-absorbent of moisture, and its support is likewise moisture resisting and thus the surfaces are kept in uniform condition for repeated removals and readhesions of the sheets or strips upon the support. The nature of the adhesive agent is such as to drive out or exclude the air from beneath, thus making a secure seating for the sheet or strip, which can at the same time be readily removed. Such an adhesive also does not. evaporate appreciably and will retain its holding power practically unimpaired for a very long time. The adhesive agent acts also to make the sheet or strip more highly translucent, and this together with the opaquing of the characters greatly facilitates the making of the printing plate, and facilitates also the placing or making up of the pages or colunms of the form, and shortens the time of the exposure to the light of the sensitized surface of the plate, as well as having other" advantages.

In accordance with certain features of the invention the sheet or strip 1 is mounted upon a suitable support 3 which is adapted to receive and hold firmly adherent upon its surface the sheet 1 while permitting of the ready cutting out, or separation, and removal of a line strip, or of a larger strip or portion and the reattachment of the same, or of another strip in place thereof. In cer-.

tain aspects of the invention, the support 3 a is also of translucent material, and it may be of glass or celluloid, or like material, and it may be either rigid or flexible.

The support 3, in the practical work of composing may be used as a support for a sheet corresponding to a galley or to a page form, and such support serves as a foundation or base to which the various sheets or strips carrying the typographic mattermay be attached, and upon and to which they may be transferred, transposed, and otherwise changed. Where the support 3 is translucent, it may also be used in making upthe form if desired, and such a use thereof is described in my copending application filed of even date, Ser. No. 874,928.

As illustrating the use of the invention, and considering the correction of a single line by way of example, the fourth line upon the sheet 1 in Fig. 1 is shown with an error therein, as indicated by reference numeral 4, such error consisting in the word the being incorrectly spelled as teh. In Fig. 2 the sheet 1 is shown upon the support 3, and the line containing the error 4 is shown separated or cut from the remainder of the sheet 1 by incisions 5 and 6. In Fig. 8 is a new or recomposed line 7 mounted on a support 9, corresponding to the cut out line 4, the word the being spelled correctly, as shown at 8, thus eliminating the error previously existing in the line. In Fig. 5, the line 7 is shown with its ends 10 raised from the support 9. It can thus be taken up without affecting the printed line and placed in position in the column or page, as shown in Fig. 4. In Fig. 4, the line 7 is shown in place in the sheet 1, in page or column alinement with other lines on sheet 1, and in justified relation therewith. I The adhesive agent employed has permitted the incorrect strip to be removed quickly and readily by merely lifting an end and pulling or stripping it off, and the new strip 7 'is putin its place by simply locating it and applying a little pressure. If these changes,- such as that just described are made in the galley proofs, the corrected matter may be taken up and put down again upon corresponding supports 3 forthe pages, the matter having been divided up into pages.

By reason of the properties of the adhesive material, the sheet or strip 1, 'or a plurality of sheets or strips anay be successively attached or applied to various or successive supports 3 in shifting about the matter in making corrections or other changes, in making up the form, or in meeting other conditions in preparingthe matter to go upon the press. The adhesive and light transmitting property ortranslucency of the sheets or strips will be practically uniform or unchanged during long periods of time, so that revises and IfQ-I'QVlSBS may be made readily and reliably after the delays common'in such work. When the sheets or strips are impregnated with the adhesive or it is applied to bothsides thereof, or is applied to the supports, the sheets or strlps may be'transferred from one support to another, and may have one side its or the other turned downwardly as desired. a

A device for carrying the sheets or strips of any size is shown in my copending application Ser. No. 874,930, dated November 30, 1914. In addition to the other advantages,

the use of the light transmitting support 3 enables proofs to be taken by the action of light, by contact printing, or otherwise at the various states of correction, revision and tion or one t, pographic 1 and the making of the The strips or sheets may sides, znay be usecl s, as desired, as for eX- on whether the printing the pa r was ocl that changes may be 1 shown and described,

vin claiins, the rincipies of the out sacrificing its chief on and. desire Y i a seeet in o rendering said siicet aclo to adhere to a support and ies of characters upon the c of a printing plate by the c of making a printing plate rises imprinting a plurality of s upon a sheet in page or dcring said sheet adhere to support and J2 J. or characters upon the Q plate by the transmitted. through said l ing printing plat p iting plurality o upon a sheet in page or pplying an agent to said l tr .nsinitting, and es characters upon the i r" cc printing plate by the transmitted. through the "ocess n airing a printing plate imprinting a plurality of upon sheet in page or rendering said sheet Klit transmitting, causing it to and impressing the lines o sensitised surface of one action of light transsheet. '7 a printing plate inting a plurality of is. g Or ,W. support, severing removing a part of the sheet containing a. line or lines of charaoiers, substiti r they sheet or cc containing a nne or lines of characters upon the support, and impressing the revised 0 r of l nes of char cters upon the sensi- Tie process of rnalrin a printing ilate s 'n 1 'iting plurality of lines of c I pen a sheet in page or column alineinent, rendering said sheet adhing it to a support, severing ng a part of the sheet containe or lines of characters, substituting ier sheet or strip containing a line or 1 es characters upon the support, and impressing the revised page of lines of characters upon the sensitized surface of a printing plate by the action 01 light.

7.. The process of making a printing plate which comprises imprinting a plurality of lines of characters upon a sheet in page or column aliuement, rendering said sheet adhesive anci light transmitting, attaching it to a support, severing and removing a part of the sheet containing a line or lines of characters, substituting another sheet or strip containing a line or lines of characters the support, im ressing the re visecl page of lines oi": ch racters upon the sensitized surface of a printing plate by the action of light.

8, The process of making printing plates which comprises imprinting a plurality of lines or" characters upon a sheet in page or column alineinent, rendering said sheet light transmitting moisture proof, attaching it to a support, severing and removing a part of the sheet containing a line or lines of characters, substituting another sheet or strip containing a iine or lines or" characters upon the support, and impressing the re visecl page of iines of characters upon the sensitized surface of a printing plate by the action of light.

a testimony whereof, I have signed my name to this specification, in the presence of 

